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日立EX-200型液压挖掘机采用微处理机控制,是一种集成度较高的机电一体化产品。该机采用了以高速开关阀控制变量柱塞泵为核心的负荷传感液压控制系统,使该机获得了最佳流量匹配,提高了作业效率和复合操纵性,达到了节能的目的。 一、高速开关阀的工作原理 高速开关阀也称脉冲开关阀,它接受来自泵阀控制器的电信号——脉冲信号,每接受一个脉冲信号,高速开关阀就完成一个快速的开关动作(油路通断时间取决于脉冲的频率)。这样,高速开关阀的迅速启闭,精确地调节进入伺服活塞的液压油流量,改变液压泵斜盘倾角来控制其排量。
Hitachi EX-200 hydraulic excavator using microprocessor control, is a highly integrated mechatronic products. The machine uses a high-speed on-off valve controlled variable displacement piston pump as the core of the load-sensing hydraulic control system, so that the machine to obtain the best flow matching, improved work efficiency and composite controllability, to achieve energy-saving purposes. A high-speed switching valve works High-speed switching valve, also known as pulse switching valve, which receives electrical signals from the pump valve controller - pulse signal, each receiving a pulse signal, high-speed switch valve to complete a fast switching action On-off time depends on the pulse frequency). In this way, the rapid opening and closing of the high-speed on-off valve accurately adjusts the flow of hydraulic oil into the servo piston and changes the displacement of the hydraulic pump swashplate to control its displacement.